Trane Tracer Unit Ventilator, ZN.520 manual Controller Features, Service, Typical Components

Controller Features

Each Tracer ZN.520 unit controller circuit board is equipped with en- hancements to help facilitate ser- vice, testing, and diagnosis.

Each board has

qManual test button,

qStatus LED,

qCommunication status LED,

qService button,

qQuick terminal connectors, and

qEasy to read screen printing. (See Figure 1: “Tracer ZN.520 Control Board”).

Service

The Trane Tracer ZN.520 unit con- troller is serviced using Rover®, the ICS software service too. Rover is designed to support the Tracer ZN.520 unit controller on the class- room unit ventilator.

For “remote” access to the com- municating units, the zone sensors offered with the Tracer ZN.520 have a telephone style (RJ-11) con- nector allowing field connection between Rover and the zone sen- sor; however, the RJ-11 connector must be connected to the terminals TB2-5 and TB2-6 on the Tracer ZN.520 unit controller.(See Figure

3:“Rover service tool connected to the RJ-11 communication jack in a zone sensor”)

The zone sensor may also be used when trying to locate a unit. By pressing the ON button on the zone sensor for 5 seconds or using the “wink” command in Rover, the cir- cuit board receives the signal caus- ing the Communication LED to “wink”. Winking allows visual identifier on the board for service technicians.

The Tracer ZN.520 also includes features such as a test output to manually test all of the end devices and color coded wires (i.e. red for heating valves and blue for cooling valves) to aid in the troubleshoot- ing process.(See “Manual Output

Test” on page 48, for more infor- mation.)

Figure 3: Rover service tool connected to the RJ-11 communication jack in a zone sensor

Typical Components

A typical classroom unit ventilator system with a DDC package con- sists of the following physical com- ponents, in addition to the mechanical equipment:

qTracer ZN.520—contains the sensor input circuits, service adjustments, microprocessor control electronics, and communications hardware.

Power is supplied by a separately mounted 24 VAC\90 VA transformer.

qSensor Modules—a variety of analog sensors that provide temperature and optional humidity sensing and CO2 sensor; and an operator interface to the Tracer ZN.520 for operating modes, status, and temperature setpoints.

qStandard End Devices—a variety of devices that help to gather information, control capacity, and provide ventilation are used by the Tracer ZN.520 in its control algorithm to condition the space to the desired temperature and relative humidity level. (See “Standard End Devices” on page13, for more information.)

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